Share songs as ringtones
You can turn a Logic Pro project into a ringtone and share it to iTunes, where you can sync it with your iPhone. A ringtone can be up to 40 seconds long.
Create a ringtone from an existing project
Open the project.
Choose File > Share > Ringtone to iTunes.
If the exported ringtone exceeds the maximum length (40 seconds), a dialog appears.
Click Adjust to have Logic Pro shorten the ringtone automatically.
Click Cancel to return to the song so you can shorten it. Set the cycle area to cover the part of the song you want to use for the ringtone.
When you share a ringtone to iTunes, it appears in the Tones list in your iTunes library, ready to sync to your iPhone.